1. Laboratory of Infectious Diseases, Graduate School of Infection Control Sciences, Ōmura Satoshi Memorial Institute, Kitasato University, Minato, Tokyo, Japan
2. Murata Animal Hospital, Mobara, Chiba, Japan
3. Research and Education Center for Prevention of Global Infectious Diseases of Animals, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan
4. Division of Clinical Laboratory, Sanritsu Zelkova Veterinary Laboratory, Koto, Tokyo, Japan